"Lentil soups can range from superhearty to watery and tasteless. This soup is the best of both worlds: filling and flavorful, yet light and vegetarian. To see this recipe with illustrated steps, check out The Basics: How to Make Lentil Soup...."
INGREDIENTS
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1 tablespoon olive oil
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1 medium celery stalk, small dice
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1 medium carrot, peeled and small dice
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1/2 medium yellow onion, small dice
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3 medium garlic cloves, minced
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Kosher salt
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Freshly ground black pepper
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1 quart low-sodium vegetable broth
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1 (15-ounce) can diced tomatoes with their juices
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1 1/4 cups lentils (any color except red), rinsed
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1 bay leaf
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1/4 teaspoon finely chopped fresh thyme leaves
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1 teaspoon red wine vinegar or sherry vinegar
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2 ounces spinach leaves (about 1/2 a bunch)